Water-in-Bisalt Electrolyte with Record Salt Concentration and Widened Electrochemical Stability Window
Artikel i vetenskaplig tidskrift, 2019

Water-in-salt and water-in-bisalt electrolytes have recently attracted much attention due to their expanded electrochemical stability windows. The concentration limit of such electrolytes is constrained by the solubility of the lithium salts employed, ca. 21 m (mol kg−1) for LiTFSI (lithium bis(trifluoromethanesulfonyl)imide). By adding a second lithium salt, the total salt concentration can be increased, but the hydrogen evolution keeps limiting the application of such systems in batteries with low potential anodes. Herein we report a water-in-bisalt electrolyte with a record salt concentration (31.4 m LiTFSI + 7.9 m Li[N(CH3)2((CH2)3SO3)((CH2)4SO3)]) in which the bulky anion completely prevents the crystallization, even at such low water contents. Although the hydrogen evolution reaction is not completely suppressed, the expanded electrochemical stability window allows for low potential reactions such as aluminum−lithium alloying. The high salt concentration favors the formation of a suitable passivation layer that can be further engineered by modifying the anion structure

Författare

Juan Forero Saboya

Chalmers, Fysik, Kondenserade materiens fysik

Elham Hosseini Bab Anari

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Kasper Moth-Poulsen Group

Muhammad Abdelhamid

Chalmers, Fysik, Kondenserade materiens fysik

Kasper Moth-Poulsen

Chalmers, Kemi och kemiteknik, Tillämpad kemi, Kasper Moth-Poulsen Group

Patrik Johansson

Chalmers, Fysik, Kondenserade materiens fysik

Journal of Physical Chemistry Letters

1948-7185 (eISSN)

Vol. 10 4942-4946

Ämneskategorier

Oorganisk kemi

Annan teknik

Kemiteknik

Annan kemiteknik

Annan kemi

Styrkeområden

Energi

Materialvetenskap

DOI

10.1021/acs.jpclett.9b01467

Mer information

Senast uppdaterat

2019-11-10